I´ve a question related to the detection of TAN. I´m working with an oil which it´s been used in a engine and I´m cheking it along it used.

In the last test I´ve had problems because of the detection of the equivalent point. I´ve tried to change the oil weight in order to separate the equivalent points, wich are two, but I can "see" the first one only.

The equipment don´t give the result of the second point, which it´s the value i´m looking for.

I´m working with D-664 method.

Thank you and best regards.